Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations
Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting...
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ftdoajarticles:oai:doaj.org/article:5ffed77e23344fd6b81cb001402793c6 2023-05-15T13:47:56+02:00 Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations Lara R. Prelle Ina Schmidt Katherina Schimani Jonas Zimmermann Nelida Abarca Oliver Skibbe Desiree Juchem Ulf Karsten 2022-07-01T00:00:00Z https://doi.org/10.3390/genes13071264 https://doaj.org/article/5ffed77e23344fd6b81cb001402793c6 EN eng MDPI AG https://www.mdpi.com/2073-4425/13/7/1264 https://doaj.org/toc/2073-4425 doi:10.3390/genes13071264 2073-4425 https://doaj.org/article/5ffed77e23344fd6b81cb001402793c6 Genes, Vol 13, Iss 1264, p 1264 (2022) growth rate climate change tolerance ecophysiology 18 S rbc L Genetics QH426-470 article 2022 ftdoajarticles https://doi.org/10.3390/genes13071264 2022-12-31T01:06:50Z Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting and the accompanying freshwater increase in coastal areas. Antarctic soft and hard bottoms are typically inhabited by microphytobenthic communities, which are often dominated by benthic diatoms. Their physiology and primary production are assumed to be negatively affected by increased temperatures and lower salinity. In this study, six representative benthic diatom strains were isolated from different aquatic habitats at King George Island, Antarctic Peninsula, and comprehensively identified based on molecular markers and morphological traits. Photosynthesis, respiration, and growth response patterns were investigated as functions of varying light availability, temperature, and salinity. Photosynthesis–irradiance curve measurements pointed to low light requirements, as light-saturated photosynthesis was reached at <70 µmol photons m −2 s −1 . The marine isolates exhibited the highest effective quantum yield between 25 and 45 S A (absolute salinity), but also tolerance to lower and higher salinities at 1 S A and 55 S A , respectively, and in a few cases even <100 S A . In contrast, the limnic isolates showed the highest effective quantum yield at salinities ranging from 1 S A to 20 S A . Almost all isolates exhibited high effective quantum yields between 1.5 °C and 25 °C, pointing to a broad temperature tolerance, which was supported by measurements of the short-term temperature-dependent photosynthesis. All studied Antarctic benthic diatoms showed activity patterns over a broader environmental range than they usually experience in situ. Therefore, it is likely that their high ecophysiological plasticity represents an important trait to cope with climate change in the Antarctic Peninsula. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula King George Island Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula King George Island Genes 13 7 1264 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
growth rate climate change tolerance ecophysiology 18 S rbc L Genetics QH426-470 |
spellingShingle |
growth rate climate change tolerance ecophysiology 18 S rbc L Genetics QH426-470 Lara R. Prelle Ina Schmidt Katherina Schimani Jonas Zimmermann Nelida Abarca Oliver Skibbe Desiree Juchem Ulf Karsten Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
topic_facet |
growth rate climate change tolerance ecophysiology 18 S rbc L Genetics QH426-470 |
description |
Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting and the accompanying freshwater increase in coastal areas. Antarctic soft and hard bottoms are typically inhabited by microphytobenthic communities, which are often dominated by benthic diatoms. Their physiology and primary production are assumed to be negatively affected by increased temperatures and lower salinity. In this study, six representative benthic diatom strains were isolated from different aquatic habitats at King George Island, Antarctic Peninsula, and comprehensively identified based on molecular markers and morphological traits. Photosynthesis, respiration, and growth response patterns were investigated as functions of varying light availability, temperature, and salinity. Photosynthesis–irradiance curve measurements pointed to low light requirements, as light-saturated photosynthesis was reached at <70 µmol photons m −2 s −1 . The marine isolates exhibited the highest effective quantum yield between 25 and 45 S A (absolute salinity), but also tolerance to lower and higher salinities at 1 S A and 55 S A , respectively, and in a few cases even <100 S A . In contrast, the limnic isolates showed the highest effective quantum yield at salinities ranging from 1 S A to 20 S A . Almost all isolates exhibited high effective quantum yields between 1.5 °C and 25 °C, pointing to a broad temperature tolerance, which was supported by measurements of the short-term temperature-dependent photosynthesis. All studied Antarctic benthic diatoms showed activity patterns over a broader environmental range than they usually experience in situ. Therefore, it is likely that their high ecophysiological plasticity represents an important trait to cope with climate change in the Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Lara R. Prelle Ina Schmidt Katherina Schimani Jonas Zimmermann Nelida Abarca Oliver Skibbe Desiree Juchem Ulf Karsten |
author_facet |
Lara R. Prelle Ina Schmidt Katherina Schimani Jonas Zimmermann Nelida Abarca Oliver Skibbe Desiree Juchem Ulf Karsten |
author_sort |
Lara R. Prelle |
title |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_short |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_full |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_fullStr |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_full_unstemmed |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_sort |
photosynthetic, respirational, and growth responses of six benthic diatoms from the antarctic peninsula as functions of salinity and temperature variations |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/genes13071264 https://doaj.org/article/5ffed77e23344fd6b81cb001402793c6 |
geographic |
Antarctic The Antarctic Antarctic Peninsula King George Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula King George Island |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island |
op_source |
Genes, Vol 13, Iss 1264, p 1264 (2022) |
op_relation |
https://www.mdpi.com/2073-4425/13/7/1264 https://doaj.org/toc/2073-4425 doi:10.3390/genes13071264 2073-4425 https://doaj.org/article/5ffed77e23344fd6b81cb001402793c6 |
op_doi |
https://doi.org/10.3390/genes13071264 |
container_title |
Genes |
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13 |
container_issue |
7 |
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1264 |
_version_ |
1766248022341058560 |